Acoustic Indoor Localization System Integrating TDMA+FDMA Transmission Scheme and Positioning Correction Technique
Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230027, China
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Sensors 2019, 19(10), 2353; https://doi.org/10.3390/s19102353
Received: 2 April 2019
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Revised: 16 May 2019
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Accepted: 17 May 2019
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Published: 22 May 2019
(This article belongs to the Section Physical Sensors)
This paper presents a novel audio indoor localization system. In the proposed system, four speakers placed at known positions transmit chirp signals according to the time-division multiple access (TDMA) plus frequency-division multiple access (FDMA) transmission scheme. A smartphone receives the signal via a built-in microphone and calculates the time differences of arrival (TDOAs). Using TDOA measurements, the position is estimated by the shrinking-circle method. In particular, to reduce the positioning error in moving conditions, a TDOA correction method based on Doppler shifts is proposed. The performance of the proposed system was evaluated in real-world experiments using a 10.971 m × 5.684 m positioning area. The results of the static-target positioning experiment showed that the TDMA+FDMA transmission scheme has more advantages in improving the update rate of the positioning system than the TDMA-only transmission scheme. The results of the moving-target positioning experiment under three different speeds demonstrated that the positioning errors were reduced by about 10 cm when the Doppler-shift-based TDOA correction method was adopted. This research provides a possible framework for the realization of a TDOA-chirp-based acoustic indoor positioning system with high positioning accuracy and update rate.
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Keywords:
Indoor localization; Chirp signal; TDOA; TDMA+FDMA; Doppler shifts
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MDPI and ACS Style
Chen, X.; Chen, Y.; Cao, S.; Zhang, L.; Zhang, X.; Chen, X. Acoustic Indoor Localization System Integrating TDMA+FDMA Transmission Scheme and Positioning Correction Technique. Sensors 2019, 19, 2353. https://doi.org/10.3390/s19102353
AMA Style
Chen X, Chen Y, Cao S, Zhang L, Zhang X, Chen X. Acoustic Indoor Localization System Integrating TDMA+FDMA Transmission Scheme and Positioning Correction Technique. Sensors. 2019; 19(10):2353. https://doi.org/10.3390/s19102353
Chicago/Turabian StyleChen, Xiang, Yuheng Chen, Shuai Cao, Lei Zhang, Xu Zhang, and Xun Chen. 2019. "Acoustic Indoor Localization System Integrating TDMA+FDMA Transmission Scheme and Positioning Correction Technique" Sensors 19, no. 10: 2353. https://doi.org/10.3390/s19102353
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